All subsequent steps must be performed as the "root" user on the server. SSH into the server as "root". You should have either the password or the passphrase having completed PHP Installation for Applications on EnGarde Secure Linux 3.0.
As of this writing the latest stable version of Joomla! is 1.0.5. Download the source tarball Joomla_1.0.5-Stable-Full_Package.tar.gz.tar.gz (it can be found at http://developer.joomla.org/) to the temporary directory /var/tmp.